What does the 'chattr' command do?

The 'chattr' command is specifically designed to change the attributes of files on a Linux file system. It allows users to modify how the kernel handles a file, impacting its behavior with respect to operations like deletion, modification, or even visibility to certain users or processes. For instance, by setting attributes with 'chattr', a user can make a file immutable, meaning it cannot be modified or deleted, or can be set to append-only, where data can only be added to the file, but not removed.

This command plays a crucial role in system security and file management, providing administrators with the ability to enforce policies directly at the file system level. The other choices refer to different functionalities; for example, copying files, removing files, or creating symbolic links involve different commands and tools within Linux. Thus, the 'chattr' command's primary purpose is accurately captured by the choice describing its function of changing file attributes.